Comments on: 1-wire meets IPv6

By: KiLaHuRtZ

KiLaHuRtZ — Wed, 22 Jun 2011 17:35:24 +0000

I am very interested in building a few of these. I see in your last comment you were in the process of re-designing the circuit to be more effecient. I was woncering if you had a schematic and/or a bill of materials you could post. Also, I was looking to connect up to 16 DS18S20’s to a single unit. Seeing 5 sensors plus the base system use 3 out of 4KB of RAM, would an ATmega1284P be a suitable upgrade?

By: CuriousCat

CuriousCat — Thu, 17 Feb 2011 14:26:43 +0000

Interesting! Does it mean that all the ethernet’s TX- TX+ RX- RX+ are multiplexed into one wire somehow? If we had a pair of this device with an infrared circuit, can two PCs working like peer-to-peer wirelessly?

By: anonymous

anonymous — Sat, 05 Feb 2011 00:51:35 +0000

teh sensors are offfliiiiiiiineeeee

By: Ken Flack

Ken Flack — Mon, 14 Jun 2010 20:59:35 +0000

Doyou know of any ‘low Cost” design for a IP V4 Standard Etherenet (One Ethernet address) to one wire interface controller.

Should have a web server/data logger for sensor data… incl..

Thanks

Ken

P.S. I absolutely love your design….

By: frederic

frederic — Wed, 24 Mar 2010 23:29:01 +0000

Hi Frederik,

I’ve just taken a look at your code and can see that you have disabled IRQ mode.

I suppose, like me, you had problems in this mode. Are you able to use this mode now ?
If yes, I should be happy to know your trick

Frederic

PS : Nice project. I do similar things at owbox.com, especialy internet of things

By: fli

fli — Wed, 27 Jan 2010 06:05:55 +0000

@Quirinius

I’m not sure about the RAM in the tuxgraphics hardware.
The stack it self should run with 2K RAM, but for any (half) serious application you
probably want 4K.

By: Quirinius

Quirinius — Tue, 26 Jan 2010 21:59:44 +0000

Wow, that’s cool!

And BTW: your temperatures are also very low.

Can the uIPv6 run on the tuxgraphics hardware?

By: Nuno Gonçalves

Nuno Gonçalves — Sun, 13 Dec 2009 11:32:44 +0000

James:

You could use a laser(or anything else). But 1-wire bus have 2 advantages:
-very low cost(for bus wire and devices).
-parasite power. You can hang thermometers(ex) on the 1-wire bus and they can “steal” power from the bus.

For a wireless approach maybe you should look for ZigBee.

By: Nuno Gonçalves

Nuno Gonçalves — Sun, 13 Dec 2009 00:37:23 +0000

Great! Great! Great!

About your problems with 1-wire bus lengths over 15m, did you account for the bus capacitance? Were you using a simple open-drain uC output with a pull-up resistor?
For such long buses you will need higher currents to pull the bus up! There are several Dallas semiconductors AN covering that.

You can decrease the pull-up resistor value(up to half the current drain capability of the uC when in drain mode, otherwise you will be getting problems for push-down phase).
You can switch to a push-pull output.
You can add an active driver with a BJT/FET.

Last option can achieve very long distances.

By: James

James — Fri, 04 Dec 2009 19:01:23 +0000

Instead of the single wire could you transmit via a modulated laser beam?